Troubleshooting Procedure; Alarm Display - Hitachi RAS-2-HVNP Service Manual

8. Troubleshooting

8.2 Troubleshooting procedure

8.2.1 Alarm display
On-screen displays during abnormal operation
• Malfunction
The RUN (red) indicator flashes.The ALARM indicator appears on the liquid crystal display.The screen
also displays the indoor unit number -A-, the alarm code -B- and the model code -C-. If there are various
indoor units connected, the above mentioned information is shown for each one of them -D-.Write down
the indications and contact your HITACHI service supplier.
• Power supply failure
All displays disappear.If the unit stops due to a power shortage, it will not start again, even though the
power comes back on. Carry out the start-up operations again.If the power failure lasts less than 2 sec-
onds, the unit will start again automatically.
• Electrical noise
The displays can disappear from the screen and the unit can stop. This is because the microcomputer
has been activated to protect the unit from electrical noise.
N O T E
If the wireless remote control is used for the wall-type indoor unit, remove the connectors (CN25)
that are connected to the indoor PCB. Otherwise the unit will not work. The stored data cannot be
erased unless the remote control is initialised.
192
SMGB0079 rev.0 - 01/2013
A